Investment Securities - Contractual maturities of investment securities (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Held-to-maturity, Amortized Cost
Due after one year through five years	$ 993
Due after five years through ten years	42,260
Due after ten years	57,345
Total Held-to-maturity Securities	100,598
Held-to-maturity, Fair Value
Due after one year through five years	840
Due after five years through ten years	35,082
Due after ten years	45,843
Total Held-to-maturity Securities	81,765
Available-for-sale, Amortized Cost
Due in one year or less	38
Due after one year through five years	99,559
Due after five years through ten years	167,122
Due after ten years	139,307
Total Available-for-sale Securities	406,026
Available-for-sale, Fair Value
Due in one year or less	38
Due after one year through five years	92,262
Due after five years through ten years	153,112
Due after ten years	121,134
Total Available-for-sale Securities	$ 366,546